Specifications

Maintenance
TX,90,JC1145 –19–23MAY96–1/1
FILLING THE COOLING SYSTEM
SPECIFICATIONS
544G Cooling system capacity Approx. 24 L (25 qt)
624G Cooling system capacity Approx. 25 L (26 qt)
644G Cooling system capacity Approx. 28.5 L (30 qt)
HOT WEATHER (above 95°C [35°F]): Antifreeze
reduces cooling system efficiency. When maximum
cooling system efficiency is required, completely drain
and flush system. Refill with clean, soft water, and add
RE23182 John Deere Coolant Conditioner or
equivalent.
IMPORTANT: Use only permanent-type, low
silicate, ethylene glycol base
antifreeze in coolant solution. Other
types of antifreeze may damage
cylinder seals.
FREEZING TEMPERATURES: Fill with permanent-
type, low silicate, ethylene glycol antifreeze (without
stop-leak additive) and clean, soft water. Add
RE23182 John Deere Coolant Conditioner or
equivalent.
IMPORTANT: After filling radiator, operate engine
to purge air from the engine block.
When air is purged, the coolant level
sensor in the radiator will turn
warning alarm on, STOP indicator
will flash, and engine coolant
indicator will light. Shut off engine
and add coolant immediately. Start
engine and run until engine is at
normal operating temperature. Stop
engine and verify that radiator is
completely full, and that surge tank
is at normal level.
NOTE: All machines are shipped from the factory with
a 50-50 mixture for protection to -37
° C (-34 ° F).
Adjust mixture accordingly to provide freeze
protection for your machine.
TX,90,JC1117 –19–18MAR96–1/1
TEST THE COOLANT FREEZE—
PROTECTION LEVEL
T85402 –UN–10NOV88
See your John Deere dealer for JT05460 SERVICE-
GARD  coolant and battery tester. Follow directions
included with the tester.
If you operate your engine in extremely cold temperatures,
see your John Deere dealer for information on arctic
operation.
90–4
PN=170